Tool-turret mechanism



No. 750,278. PATENTED JAN. 26, 1904. 1 B. M. W. HANSON. TOOL TURRET MECHANISM.

APPLICATION FILED JUNE 9, 1902.

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No. 750,278. PATBNTED JAN. 26, 1904.

B. M. w. HANSON.

TOOL TURRBT MECHANISM.

APPLIOAITION FILED JUNE 9, 1902.

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No 750,278. ATBNTED JAN. 26, 1904.

-B,..M. W. HANSON TOOL TURRET MECHANISM. APPLICATION nun HIRE a. 1902.

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UNITED STATES Patented January 26, 1904.

PATENT OFFICE.

BENGT M. W. HANSON, OF HARTFORD, CONNECTICUT, ASSIGNOR TO PRATT & \VHITNEY COMPANY, OF HARTFORD, CONNECTICUT, A CORPORATION OF NEW JERSEY.

TOOL-TURRET MECHANISM.

SPECIFICATION forming part of Letters Patent No. 750,278, dated January 26, 1904:.

Application filed June 9, 1902. Serial N0 110,856. (No model.)

To (LZZ whom it may concern.-

Be it known that I, BENGT M. W. HANSON, a citizen of Sweden, and a resident of Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Tool-Turret Mechanism, of which the following is a full, clear, and exact specification.

This invention relates to improvements in the mechanism for locking and unlocking and rotating the tool-turrets of screw-machines, lathes, and other analogous machines.

The objects of this invention are, first, to provide a locking-bolt arranged in a central relation to the turret and having a locking engagement with the front portion of the turret nearest to the operating position of the tools; second, to provide an abutment readily adjustable from the exterior for withdrawing the locking-bolt and operating the indexing-pawl, so that the abutment may be readily moved to any position at which it may be desired to unlock and index the turret; third, to provide means operable from the exterior for holding the indexing-pawl out of operation, so that the turret may readily be turned by hand in either direction when the locking-bolt is withdrawn; fourth, to improve the details of construction in connection with the features enumerated.

Figure 1 of the drawings is a plan view, and Fig. 52 a front elevation, of a machine embodying my present improvements. Fig. 3 is a plan view in section taken on the line 3 3 of Fig. 4. Fig. 4 is a front View in section taken along the line 4 9 of Fig. 3, from which this view is projected. Fig. 5 is a front view in section taken along the line 5 5 of Fig. 3. Fig. 6 is a plan view of the adjustable abutment for operating the locking-bolt and the indexing-pawl. Fig. 7 is a rear view in section taken along the line 7 7 of Fig. 3, Fig. 8 is a plan view in section taken along the line 8 8 of Fig. 7. Fig. 9 is a front view in section. taken along the line 4 9 of Fig. 3, showing in a different position the parts which are illustrated in Fig. 4c.

The tool-carrying turrets of machines of this class are usually rotatably mounted upon a longitudinally-movable turret support or slide which carries the sliding bolt employed for locking the turret in position and also carries the sliding and oscillating pawl which is employed for indexing the turret upon its axis when the locking-bolt is withdrawn. The

locking-bolt and pawl are actuated by means of abutments seated in the carriage or head in which the turret-slide is mounted, the lockingbolt and pawl mechanisms being brought against their respective abutments by the rearward movement of the turret-slide. These abutments are either fixed or at most are adjustable only in avery slight degree and only from the interior of the mechanism. Hence it is impossible to vary from the exterior, and only then in slight: degree, the positions at which the turret is rotated, it being necessary to move the entire carriage, turret, and slide in order thus to vary to any considerable extent the longitudinal position at which the turret may be indexed. Furthermore, it has been customary to locate the locking-bolts at one side of the pivot shaft or stud upon which the turret is mounted, and inasmuch as this shaft or stud should be of considerable size in order to afford a stable basis for the turret the result has been to locate the locking-bolt considerably to one side of the center, so that the direction of its movement, which for best results should be as nearly as possible at a right angle with the direction of movement of the turret, or, in other words, in a radial relation to the center of the turret, is considerably at an angle to that radial, relation, and hence does not perform its allotted function to best advantage.

In the customary construction and arrangement of turret mechanism of this class it is also impossible to rotate the turret excepting in a forward direction. It is, however, frequently desirable to rotate the turret backwardly either in order to bring back to operative position a tool which has improperly or imperfectly performed its operation upon the work, or in the case where only two or three tools are employed in a turret for certain operations it is desirable thus to swing back the turret after the last tool has performed its function in order to bring the first tool into operation upon the succeeding piece of work rather than consume the time and energy required to swing the turret all the way around, as is necessary in the ordinary construction. In the present invention these desirable features are attained by mounting the stop-abutments for the locking-bolt and index-pawl upon the bed and adapting them to be moved longitudinally and clamped thereon in any desired position by mounting the locking-bolt centrally with the turret to move in a radial relation thereto and by providing means whereby the indexing-pawl may either perform its usual function in the automatic indexing of the turret or be held out of operation altogether, so that the turret may be turned by'hand in either direction.

Referring to the drawings, the numeral designates the bed or frame upon which my improved mechanism is mounted, the bed being undercut at 11 to permit ready access to the clamping-lever 54 of the adjustable abutments. The turret support 12 is fitted to slide longitudinally upon the bed, being thus moved in any of the well-known ways, either by means of a rack-and-pinion movement operated by a wheel or by means of a hand-lelever, as shown in Figs. 1 and 2, pivotally mounted upon a pivot-bracket 13, which, as here shown, may be made adjustable longitudinally of the bed and be clamped at any desired longitudinal position thereon. The turret' 14, which is herein shown to be of the vertical type, is rotatably mounted upon a large stud 15, firmly fixed in the turret-support. The lower side of the turret is provided with a downwardly-projecting flange 16, which is usually an annular flanged collar made of steel and hardened to withstand the wear incident to its use. This flange is provided with a series of locking recesses or notches 17, corresponding in number and relative position with the tools carried by the turret. My improved locking-bolt 20 is adapted to engage with these locking-notches 17 of the turret and is mounted in a slideway on the turret-support 12 centrally with the axis of rotation of the turret, the locking-bolt being provided with an elongated opening 19, through which projects the pivot-stud 15 of the turret and the boss 18 of the turret-support, to'which the stud is secured. The locking-bolt is supported at its sides by means of tapering gibs 21, which are adjustable longitudinally by means of the screws 22, so as to take up the lost motion due to wear and also to adjust the locking-bolt sidewise to Vary or correct the rotary position of the turret and its tools when locked to place. The main body of the locking-bolt is below the plane of the bottom of the locking-flange 16 of the turret and is provided with an upwardly-projecting wedge-shaped portion 24, which fits into the notches 17 being pushed forwardly into those notches by means of the spring 25, applied at the rearward end of the turret-support 12, the end of the latter being closed by means of a screw 26, so that the spring may readily be removed and replaced.

The locking-bolt 20 is operated by means of a dog 28, which is mounted upon the pivotbolt 29, mounted in the turret support or slide 12, being retained therein by a screw threaded portion, as shown in Fig. 7 The dog is provided with a spring 30, which serves to hold the dog yieldingly against the rearward end of the slot 31, into which the upper end of the dog extends from below, as shown in Fig. 4. The lower end 32 of the dog extends downwardly into the plane of the projecting abutment 33, so that as the dog is carried back'wardly with the slide its lower end rides over the abutment 33 and throws the bolt 20 backwardly against the pressure of the spring 25, as shown in Fig. 9, thereby withdrawing the front end of the bolt from its locking-notch of the turret and allowing the latter to be turned by its indexing-pawl or by hand.

The indexing-pawl 35 is pivotally mounted upon the sliding block 36, which is fitted in the turret-slide to move longitudinally thereof to the extent required for indexing the turret through its angular movement. This pawl and its sliding block, the ways in which the block is mounted, and the cap 37,- which is fitted beneath the block to keep it in its ways, are best shown in Figs. 5 and 7 The block is held in its rearward position (shown in Fig. 5) by means of the plunger 38 and the spring 39, the downwardly-projecting shoulder 40 serving as a stop against the end of the cap 37. The pawl 35 is mounted upon the top of the block on the pivot-pin 42. The body of the pawl is below the plane of the series of indexing-pins 43, which project downwardly from the turret, as best shown in Fig. 5, the forward or pin-engaging end 44 projecting upwardly into engaging relation to those pins. The pawl is adapted to oscillate upon its pivot 42 to the extent shown in Fig. 8, so as to carry it into or out of engaging relation to the series of indexingpins. The pawl is provided with a spring 45, which bears against the stud 46 and tends to hold the pawl yieldingly to' the position shown in dot-and-dash lines in Fig. 8, which is its index-pin-engaging position. The forward side of the upwardly-projecting end 44 of the pawl is rounded at 47 or otherwise adapted to engage with the indexingpins 43. In order to enable the pawl to clear the succeeding indexing-pin as it is drawn backwardly in its indexing operation upon each pin, the rearward side of the end 44 of the pawl is beveled at 48 to form a cam-surface by which the pawl is swung outwardly by that succeeding pin against the tension of the tion shown in Fig. 9 and by the time the locking-bolt 20 is withdrawn the downwardlyprojecting shoulder 40 of the pawl-block collides with the abutment 50, as approximately shown in Fig. 5. As the abutment prevents the further backward movement of the block and its pawl 35, the continuing backward movement of the turret and its slide draws the adjacent indexing-pin 43 against the front sideof the pawl, as shown in Figs. 3 and 5, the continuing movement turning the turret to its next position. As the backward movement of the turret and its slide continues from the position shown in Fig. 9 the lower end of the dog 28 passes the. abutment 33, thereby permitting that dog .to swing back, and thus allowing the locking-bolt 20 to be pushed forward into its locking-notch by the action of the spring 25. The turret and slide are then moved forward, the lower end of the dog 28 swinging backwardly as it passes over the abutment 33 and assuming its upright position'(shown in Fig. 4) after passing the abutment. As the shoulder 40 of the pawl-slide is carried away from the abutment by the forward movement of the turret-slide the pawl and its block are pushed forwardly by their spring 39 to the position shown in Fig. 5, the beveled side 48 of the pawl end 44 serving to cam that end of the pawl outwardly around the succeeding indexing-pin. In order to enable the indexing movement to be effected at any part of the backward movement of the turret and slide, the abutments 33 and 50 are mounted upon or integral with an abutment-slide 51, which is fitted in longitudinally-extending Ways of the bed 10, as best shown in Fig. 7, being clamped to place at any desired position longitudinally of the bed by means of the bolt 53 and the hand-nut 54, that bolt andthe hub 55 of the slide 51 being extended downwardly, as shown in Figs. 5 and 7, far enoughto enable the hand-nut 54 to be readily reached by the hand of the operator through the undercut 11 or below the level of the bottom of the bed. By these means the operator is enabled to quickly adjust and clamp the abutment-slide 51, and thereby cause the indexing apparatus to operate at its most advantageous position for each particular kind of work to be done.

In order to enable the operator to rotate the turret by hand in either direction, means are herein provided for throwing the indexingpawl out of operation without interfering with the functions of the locking-bolt or of any part of the machine. These means consist of the plunger 58, which is mounted in the turret support or slide 12, as shown in Figs. 1, 3, 7, and 8, the front projecting end of the plunger being preferably knurled to enableit to be handled more readily. The plunger is fitted to slide longitudinally in its seat, so as to carry its inner end into or out of engaging relation to the rearward end of the indexing-pawl 35. When it is desired to hold the indexing-pawl out of operation, the plunger is pushed to its innermost position (shown in Fig. 8) against the rearward end 60 of the indexing-pawl, thereby holding the forward end 44 of the pawl out of engagement with the indexing-pins 43. In this position of the plunger 58 and the pawl 35 upon moving the turret and its slide to the position of Fig.

9, so as to withdraw the locking-bolt, the turret may be rotated freely by hand in either direction, forwardly or backwardly, so as to bring any desired tool to bearupon the work. Upon moving the slide and its turret forward again the turret is locked in the position to which it is thus set by hand, with the same effect as though it had been regularly indexed to that position by the operation of the pawl. In order to retain the plunger 58 in either of its two longitudinal positions of action and inaction, respectively, it is provided with two peripheral grooves 61 and 62 for receiving the end of the screw-pin 63, fixed in the turret-slide, and these two grooves are connected by the longitudinal groove 64, thus forming a double bayonet-lock. By turning the plunger 58 so that the groove 64 agrees with the pin 63 the plunger may be moved longitudinally from one position to the other, and

by turning the plunger slightly, so as to carry the pin. into the longitudinal grooves 61 and 62, the plunger is retained in its inner and its outer positions, respectively.

An important advantage of this invention resides in the fact that the movable abutments for operating the rotating and locking devices are mounted below the turret mechanism and within the area occupied by the turret-slide, which supports that mechanism, instead of projecting rearwardly of the turretslide, and thereby requiringa longer bed and in some instances encroaching upon the space required for foot-blocks or other mechanism. Furthermore, by this arrangement the clamping-handle 54 is brought much nearer to the vertical plane of the turret, thereby enabling the operator to reach and operate the clamping devices while watching the tools at the front of the turret to insurethat the adjustments give proper clearance to the respective tools. This location of the abutments and clamping devices furthermore protects them more completely from the oil and chips with which machines of this class are flooded during operation, so that none of the chips are IIO liable to get between the abutments and their respective coengaging devices of the turret mechanism.

I claim as my invention- 1. The combination with turret-operating mechanism of a bed, an abutment mounted for longitudinal adjustment on the bed beneath the said mechanism, and provided with means for cooperating with the-said mechanism, during movement of the turret.

2. The combination with turret-operating mechanism, of abed, provided with a slideway for the turret mechanism, and an abutment mounted for longitudinal adjustment on a slideway of the bed, alongside of the slideway of the turret mechanism, and provided with means for cooperating with the said mechanism during movement of the turret.

3. The combination with turret-operating mechanism, of a bed provided with a slideway for the turret mechanism, a slideway having an abutment mounted therein for longitudinal adjustment, and provided with means for cooperating with the said mechanism during movement of the turret, and a clamping device for said abutment operable from beneath the turret mechanism.

4. The combination with a turret mounted upon a slide, and arranged to be automatically indexed by the longitudinal movement of the slide, a pivoted indexing-pawl mounted to swing into and out of the path of travel of its cooperating indexing member of the turret, and means operable from the exterior of the mechanism for holding the pawl out of the path of travel of its cooperating indexing member of the turret.

5. The combination With a turret provided with an indexing member, and mounted upon a slide arranged to be automatically indexed by the longitudinal movement of the slide, a pivoted indexing-pawl mounted to swing into and out of the path of travel of the indexing member of the turret, and a manual controlling devicefor the pawl, comprising a longitudinally-movable plunger extending from the exterior of the mechanism and movable into and out of engagement with the pawl to hold it out of the path of travel of the indexing member of the turret.

6. The combination with a turret provided with an indexing member, and mounted upon a slide and arranged to be automatically indexed by the longitudinal movement of the slide, a pivoted indexing-pawl 35, having'a rearward extension 60, a manually-operated plunger 58 movable into or out of engagement with the extension 60, and provided with a locking-groove, and a pin for locking it in and out of its pawl-engaging position.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, June 3, 1902.

BENGT M. W. HANSON.

Vitnesses:

H. E. BAILEY, W M. H. HONISS 

